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[[!meta copyright="Copyright © 2011 Free Software Foundation, Inc."]]
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[[!meta title="libpthread: pthread_key_create, reuse"]]
IRC, FreeNode, #hurd, 2011-07-02
[[!tag open_issue_libpthread]]
< pinotree> hm, maybe i found a libpthread bug
* pinotree tries a testcase
< pinotree> yesssss, found the bug :)
< pinotree> youpi: it's a problem of the key reuse in pthread_key_create()
< youpi> it doesn't reset it?
< youpi> were you looking at the licq issue?
< pinotree> no, gtest
< youpi> k
< youpi> licq has a failing threadspecific issue
< youpi> [ FAILED ] ThreadSpecificData.dataDeletedWhenThreadExits
< pinotree> basically, pthread_key_delete() does not delete the key values
from the "thread_specifics" ihash
< pinotree> but those were new keys, so i'm not sure it is allowed to
return values of previous keys?
< pinotree> after all, the actual key value is an implementation detail,
applications shouldn't care about it being reused
< pinotree> (imho)
< youpi> Upon key creation, the value NULL shall be associated with the new
key in all active threads.
< youpi> ok, so we have to clear it in all threads
< youpi> that's a pity
< pinotree> or just remove the entry from the hash on key removal
< youpi> pinotree: from all the hashes, you mean?
< pinotree> youpi: from how i see it, adding a snippet like
http://paste.debian.net/121690/ in pthread_key_delete() should do the job
< youpi> that only drops from the current thread
< pinotree> ah hm, other threads
< youpi> we need to drop from all threads
< youpi> that's the pity part
< pinotree> youpi: the licq case could look like a similar issue, at a
veeery quick glance
Test program: [[pthread_key_create_reuse.c]]
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